Raden Orb Damage

My 25m Guild lost a bit of our ranged core from a grueling Lei Shen progression. We lost a main tank around 100 pulls into the fight and had to fight our way back with a new tank and lost people every week.

We are on Raden now and we are having severe problems with orb damage as we have 8 melee, 11 ranged.

Does anyone know a ranking off hand as far as which class/specs are best for raden orb damage? I have been looking through logs and they give me a rough idea but some insight would be helpful.

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Officer in the World First Guild Method.
We are recruiting any exceptional players who want to play at a World first level.www.method.gg
Currently playing healer (Resto Druid main).

Spriests>=Desto Locks>Arcane Mages all do really high dps
Hunters>=Moonkins do medium to high dps
Every other ranged does medium dps
Shuriken toss Rogues are the darkhorses if you need even more dps
MW monk CJL last resort maybe?

Don't bother trying to have melee switch to the orb in 25 man, the lightning jumps far too quickly. You can get maybe 2 globals off on it when it enters the "inner circle" of the room if you're tanking ra-den in the middle as a melee, while still being safe - which I guess is worthwhile. But having them run all the way out to DPS will never end well.

As said though - make use of your ret pallies. They do a shitton of dmg, even if they don't like it because they lose singletarget DPS.